@Melonballs1 the communication sounds really positive - hang in there both of you, you need to make your body healing the absolute top priority in all of this!
Along those lines - have you had an iron test since birth? If you lost a lot of blood/had complications beforehand anyway, and particularly if you've not had a transfusion postpartum, please be aware that a low iron count will have a significant impact on both your body's ability to heal quickly and your milk production as baby grows.
The NHS can be really hit & miss on this and with health visitor services a fraction of what they were 2 decades ago, I would suggest you're proactive in asking for an iron count test from GP if you didn't get it prior to discharge from hospital.
Obviously it's normal for it to be slightly low after birth anyway, but knowing where it is today can help. And look at supplementation that doesn't cause constipation, adding lots of leafy greens & high iron food, and additional fibre into the diet your husband is preparing for you over the next month.
It's really, really hard to tell what is 'lacking in energy' with a newborn, because it's all just hard. But if your blood isn't carrying the building blocks for your repair & baby's milk, you'll be even further depleted!
Hope you can get your husband on board for cooking a really good 'body mending' meal plan & get GP support too now rather than waiting til 6 week check. Mending those stitches is number 1 priority right now!!!
Good luck 